Ovum hispidum ssp. trifurcatum Eisenack, 1931, p.112, pl.4, figs.21–23.

Name not validly published: specific name not validly published.
NOW Peteinosphaeridium trifurcatum (Acritarch). Originally Ovum hispidum subsp. trifurcatum (name not validly published), subsequently Hystrichosphaeridium trifurcatum, thirdly Baltisphaeridium trifurcatum (Acritarch), fourthly (and now) Peteinosphaeridium trifurcatum (Acritarch).
Taxonomic junior synonyms: Peteinosphaeridium bergstroemii Staplin et al., 1965, an acritarch species, according to Eisenack (1969a, p.254–255); Baltisphaeridium trifurcatum subsp. breviradiatum (subsequently Peteinosphaeridium breviradiatum), according to Eisenack (1969a, p.255), who considered Baltisphaeridium trifurcatum subsp. breviradiatum to be the senior name.

Holotype: Eisenack, 1931, pl.4, fig.21
Age: Ordovician (based on material from an erratic)